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(No Model.) 4 V E. A. SOHOBTTEL.

Transmitting Telephone.

No. 237,633. Patented Feb. 8,1881.

1N VEN TOR A TTORNEK NErERS, PNOTO-LITHOGRAFHER. WASHIRGION. D, C

UNrrEn STATES Arena heron.

EDWARD A. SGHOETTEL, OF BROOKLYN, ASSIGNOR OF ONE-HALF TO FRED- ERICK K. FITCH, OF NEW YORK, AND J. MILTON STEARNS, JR, OF

BROOKLYN, N. Y.

TRANSMITTING-TELEPHONE.

SPECIFICATION forming part of Letters Patent No. 237,633, dated February 8, 1881.

Application filed September 30, 1880.

To all whom it may concern Be it known that I, EDWARD A. SoHoEr'rEL, of Brooklyn, in the county of Kings and State of New York, have invented certain new and useful Imprm'ements in Transmitting-Telephones; and I do hereby declare that the following is a full, clear, and exact description of -he invention, whichwill enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, which form a part of this specification, in which- Figure 1 is a vertical central section of telephone. Figs. 2 and 3 are similar sections of modifications. Fig. 4 is a rear view of detail.

Myinvention has relation to transmitting or carbon telephones; and it consists in the novel construction hereinafter described and claimed, the object being to provide an instru- 2o ment made of materials which shallnot generate such sonorous vibrations or local tones as usuallyimpair distinctness of articulation,and which shall also be so constructed and framed that the contact-points cannot entirely separate or break under ordinary usage, and will consequently remain intact and undisturbed, and unproductive of sparks, allowing larger batteries to be used in charging the primary of the induction-coil than would otherwise be 0 expedient.

Another object of my invention is to provide an instrument in which the contact-points will require no adjustment, but after being once properly arranged will remain in proper position and relation, thus avoiding the necessity and annoyance of constant attention, to which many transmittin g-telephones areliable.

The instrument embodying my improvements embraces a diaphragm of metal or other suitable material, and itmust be understood, as an essential condition, that the diaphragm is out of and forms no part of the electric circuit.

In the drawings, A designates the case or box of the instrument, to which the diaphragm B isproperlyfitted. Abovethelatterisabracket,

(J, which supports the contact-holders, consisting of the two pendent arms D E, which are made of hard rubber, wood, or other material, preferably non-metallic, which will be nonof the diaphragm.

(No model.)

resonant to such a degree that their vibration will generate no such sonorons or foreign tones or sounds as will impair the distinctness of articulation, or be appreciable in the receiver. The arm D is pivoted to the bracket, while the arm E is attached to the upper end of the arm D bya light flexible connection, F, which serves the purpose of a very yielding hinge, and'allows the arm E an independent movement, so that it may respond to the vibrations Instead of having the arms D E made of separate pieces joined together by a flexible connection, they may be made integral, the material of which they are composed being made very thin at the bend, so as to be flexible.

The lower end of arm D is curved inwardly toward the inner surface of the diaphragm, and is held lightly in contact therewith by means of an adjustable counterpoise, G. In some cases a spring, H, may be used, instead of a weight, to maintain contact of arm D and diaphragm, as shown in Fig. 4.; but the weight is preferable, being-less liable to lose adj ustment or get out of order.

K L are the contacts, securely fitted in or to the arms D E. The contacts may be of carbon or metal; butI prefer having one made of carbon and the other, say, of platinum. The contacts are held in mutual contact by the weight of the arm E alone, and their closeness of impingement or degree of pressure disturbed by the vibrations of the arm D followin g those of the diaphragm.

contact with the diaphragm may be dispensed 9 5- with.

By the terms dull or non-resonant, as used in the claims, I mean non-productive of metallic or foreign sounds, such as would be generated if the arms D E were made of metal, or if the diaphragm were part of the electric circuit. The arms D E, being made of wood, hard rubber, or its equivalent, are practically dull in tone, or non-resonant. Their vibration will be simply responsive to the vibrations of the diaphragm, and there will be no ringing or prolonged tones.

Having described my invention, I claim- 1. The combination, with the diaphragm B, of the arms D E, supporting or holding the respective contacts, the arm E being sustained by the arm D, the contacts held in impin gementby gravityfiree from sliding friction, and the arm D being in contact with the diaphragm, substantially as set forth.

2. In a telephonic transmitter orcarbon telephone, in which the diaphragm is isolated from the telephonic circuit, the combination of the arms D E and contacts K L, one of said arms being in contact with the diaphragm, substantially as specified.

3. In a telephonic transmitter or carbon telephone, the combination, with the diaphragm and the contacts through which the current is varied, of the contact-supports, constructed of wood, hard rubber, or other suitable non-resonant or dull material, substantially as specified.

4. The combination, with the diaphragm and suitable contact-holders, one of which is in contact with the diaphragm, of the contacts K L, held in impingement by gravity alone, and isolated in circuit from the diaphragm.

5. The combination, with the diaphragm I3 and bracket G, of the arms D E and contacts K L, said diaphragm being isolated from the circuit, and the arms D E being flexibly connected together, substantially as described.

6. In combination with the diaphragm B, contact-holders D E, and contacts K L, the bracket 0, and a suitable weight or spring for keeping the diaphragm and arm I) in contact, substantially as set forth.

7. In a telephonic trausmitteror carbon telephone, the combination, with the diaphragm B,isolated from the circuit, of the contacts K L, with their movable supports, one of which impinges against or is in communication with the diaphragm.

In testimony that I claim the foregoing as my own I have hereto affixed my signature in presence of two witnesses.

EDWARD ALFRED SCIIOET'IEL.

Witnesses:

J. MILTON STEARNS, J r., JOHN M. STEARNS. 

